Discloses a liquid pharmaceutical formulation comprising: (a) 50±7.5 mg/mL to 250±37.5 mg/mL of an antibody or antigen-binding fragment thereof that specifically binds human proprotein convertase subtilisin kexin-9 (PCSK9), wherein the antibody comprises a heavy chain complementarity determining region (HCDR) 1 of SEQ ID NO:2, an HCDR2 of SEQ ID NO:3, an HCDR3 of SEQ ID NO:4, a light chain complementarity determining region (LCDR) 1 of SEQ ID NO:6, an LCDR2 of SEQ ID NO:7, and an LCDR3 of SEQ ID NO:8; (b) 10±1.5 mM histidine (pH 6.0±0.3); (c) 0.01±0.0015% w/v polysorbate 20; and (d) 10±1.5% sucrose.